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In C the use of any automatic variable before it has been initialized yields undefined behavior, as does integer division by zero, signed integer overflow, indexing an array outside of its defined bounds (see buffer overflow), or null pointer dereferencing. In general, any instance of undefined behavior leaves the abstract execution machine in ...
Integer overflow handling in various programming languages Language Unsigned integer Signed integer Ada: modulo the type's modulus: raise Constraint_Error: C, C++: modulo power of two: undefined behavior C#: modulo power of 2 in unchecked context; System.OverflowException is raised in checked context [10] Java
C++20 is a version of the ISO/IEC 14882 standard for the C++ programming language. ... (signed integer overflow remains undefined behavior) [32] a revised memory ...
If both the pointer and result point to elements of the same array object, or one past the last element of the array object, the evaluation shall not produce an overflow; otherwise, the behavior is undefined." As you can see, the mere evaluation of such an expression results in undefined behaviour; no dereferencing or assignment need have occurred.
John Regehr is a computer scientist specializing in compiler correctness and undefined behavior.As of 2016, he is a professor at the University of Utah.He is best known for the integer overflow sanitizer which was merged into the Clang C compiler, [1] the C compiler fuzzer Csmith, [2] [3] and his widely read blog Embedded in Academia.
The types float and int32_t are not compatible, therefore this code's behavior is undefined. Although on GCC and LLVM this particular program compiles and runs as expected, more complicated examples may interact with assumptions made by strict aliasing and lead to unwanted behavior.
C and C++ distinguish implementation-defined behavior from unspecified behavior. For implementation-defined behavior, the implementation must choose a particular behavior and document it. An example in C/C++ is the size of integer data types. The choice of behavior must be consistent with the documented behavior within a given execution of the ...
The SIGFPE signal is sent to a process when an exceptional (but not necessarily erroneous) condition has been detected in the floating-point or integer arithmetic hardware. This may include division by zero, floating-point underflow or overflow, integer overflow, an invalid operation or an inexact computation. Behaviour may differ depending on ...